[This will require some background explanation.] We have a View (D7) displaying a custom content type. Flag Lists provides the option to select items via checkboxes and add them to a personal list. However some items are excluded from being available to add to such lists, and that it established by a boolean checkbox ("allowed" if checked) in the creation of the node. If NOT checked, the Flag List Operations checkbox in the View is rewritten by something else – currently, replaced by a simple text "X".
Now we want to provide a tooltip message explaining why this item is not available to be selected – using Tipsy, Q-tips or something like that. To display such a message only for the ones where the checkbox has been rewritten with X or something else, I believe it needs to have a unique class that also applies to all other such instances. SO: Is there a way to make those instances have a unique class so they can trigger the tooltip message only when it's relevant?